Reference signal sequence configuration method and network device

ABSTRACT

A reference signal sequence configuration method includes: selecting, by a network device and from candidate IDs, an ID used for generating a reference signal initialization sequence for a terminal, where the candidate IDs include at least two IDs, and the selected ID does not include a scrambling ID; and generating a reference signal initialization sequence for the terminal according to the selected ID. An implementation manner of the present invention further provides a network device. In the reference signal sequence configuration method and the network device, a reference signal initialization sequence is generated according to the selected ID, thereby providing a manner of generating a reference signal initialization sequence different from the manner in the prior art.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/606,576, filed on May 26, 2017, which is a continuation of U.S.patent application Ser. No. 14/095,152, filed on Dec. 3, 2013, now U.S.Pat. No. 9,681,312, which is a continuation of International ApplicationNo. PCT/CN2012/076448, filed on Jun. 4, 2012, which claims priority toChinese Patent Application No. 201110149706.0, filed on Jun. 3, 2011.All of the afore-mentioned patent applications are hereby incorporatedby reference in their entireties.

TECHNICAL FIELD

The present application relates to the field of mobile communicationwireless transmission technologies, and in particular, to a referencesignal sequence configuration method and a network device.

BACKGROUND

In a long term evolution-advanced (LTE-A) R10 protocol, an evolved basestation (eNB) sends a downlink demodulation reference signal to aterminal (User Equipment), and the terminal uses the downlinkdemodulation reference signal (DMRS) to perform channel estimation, soas to perform data demodulation. A DMRS sequence is generated throughthe following formula:

$\begin{matrix}{\mspace{79mu} {{{r(m)} = {{\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {2\; m} \right)}}} \right)} + {j\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {{2\; m} + 1} \right)}}} \right)}}},{m = \left\{ \begin{matrix}{0,1,\ldots \mspace{14mu},{{12\; N_{RB}^{\max,{DL}}} - 1}} & {{normal}\mspace{14mu} {cyclic}\mspace{14mu} {prefix}} \\{0,1,\ldots \mspace{14mu},{{16\; N_{RB}^{\max,{DL}}} - 1}} & {{extended}\mspace{14mu} {cyclic}\mspace{14mu} {prefix}}\end{matrix} \right.}}} & {{Formula}\mspace{14mu} 1}\end{matrix}$

In Formula 1, r(m) is a DMRS sequence, N_(RB) ^(max,DL) is the number ofresource blocks included in the maximum system bandwidth among allsystem bandwidths, and c(2m) and c(2m+1) are determined by the followingFormula 2:

c(n)=(x ₁(n+N _(C))+x ₂(n+N _(C)))mod 2

x ₁(n+31)=(x ₁(n+3)+x ₁(n))mod 2  Formula 2

x ₂(n+31)=(x ₂(n+3)+x ₂(n+2)+x ₂(n+1)+x ₂(n))mod 2

In Formula 2, N_(C)=1600, x₁(0)=1, x₁(n)=0, and n=1, 2 . . . , 30.

c_(init)=Σ_(i=0) ³⁰x₂(i)·2^(i), which is an initialization sequence ofx₂. Specifically, a formula for generating C_(init) (C_(init) isreferred to as a reference signal initialization sequence in thefollowing) is:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID) ^(cell)+1)·2¹⁶ +n _(SCID)

In the formula, n_(s), is a time slot number N_(ID) ^(cell) is a cellidentifier (ID), and n_(SCID) is a scrambling ID.

As can be seen from the above formula, currently, a manner of generatinga reference signal initialization sequence by a system is limited.

SUMMARY

A reference signal sequence configuration method and a network deviceare provided.

A provided reference signal sequence configuration method includes:

selecting, by a network device and from candidate identifiers IDs, an IDused for generating a reference signal initialization sequence for aterminal, where the candidate IDs include at least two IDs, and theselected ID does not include a scrambling ID; and

generating a reference signal initialization sequence for the terminalaccording to the selected ID.

A provided network device includes:

an ID selection module, configured to select, from candidate IDs, an IDused for generating a reference signal initialization sequence for aterminal, where the candidate IDs include at least two IDs, and theselected ID does not include a scrambling ID; and

a reference signal initialization sequence generation module, configuredto generate a reference signal initialization sequence for the terminalaccording to the ID selected by the ID selection module.

In the reference signal sequence configuration method and the networkdevice, an ID used for generating a reference signal initializationsequence is selected from at least two candidate IDs, the selected IDdoes not include a scrambling ID, and the reference signalinitialization sequence is generated according to the selected ID,thereby providing a manner for generating a reference signalinitialization sequence different from the manner in the prior art.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a flow chart of an embodiment of a reference signal sequenceconfiguration method according to the present invention;

FIG. 2 is a flow chart of an embodiment of a reference signal sequenceconfiguration method at a base station side according to the presentinvention;

FIG. 3 is a flow chart of an embodiment of a reference signal sequenceconfiguration method at a terminal side according to the presentinvention;

FIG. 4 is an overall flow chart of an exemplary embodiment of areference signal sequence configuration method according to the presentinvention;

FIG. 5 is a schematic structural diagram of an embodiment of a networkdevice according to the present invention;

FIG. 6a to FIG. 6d are four schematic structural diagrams of anembodiment of a base station according to the present invention; and

FIG. 7a to FIG. 7b are two schematic structural diagrams of anembodiment of a terminal according to the present invention.

DESCRIPTION OF EMBODIMENTS

In order to make the objectives, technical solutions and advantages ofthe present invention clearer the present invention is further describedin detail with reference to the accompanying drawings.

As shown in FIG. 1, in an embodiment of a reference signal sequenceconfiguration method according to the present invention, the followingsteps are included.

Step 101: A network device, which includes a base station or a terminal,selects, from candidate IDs, an ID used for generating a referencesignal initialization sequence for a terminal, where the candidate IDsinclude at least two IDs, and the selected ID does not include ascrambling ID.

Step 102: Generate a reference signal initialization sequence for theterminal according to the selected ID.

When the network device is a base station, as shown in FIG. 2, aspecific process may include the following steps.

Step S201: The base station selects, from candidate IDs, an ID used forgenerating a reference signal initialization sequence for a terminal,where the candidate IDs include at least two IDs, and the selected IDdoes not include a scrambling ID either.

Step 202: The base station generates a reference signal initializationsequence according to the selected ID, and sends a reference signalinitialization sequence generation indication to the terminal accordingto the selected ID, so that the terminal can generate a reference signalinitialization sequence according to the indication.

In an implementation manner, a formula for the base station to generatea reference signal initialization sequence for the terminal is:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID)+1)·2¹⁶ +n _(SCID)  Formula 3,

n_(s) is a time slot number, n_(SCID) is a scrambling ID, and N_(ID) isthe ID used for generating the reference signal initialization sequenceand selected for the terminal from the candidate IDs. The candidate IDsinclude: a combination of any two or any more than two of a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID. In manners of the following embodiments, unless otherwisedescribed, the candidate IDs include the same content as that describedherein.

In the base station, correspondence between scrambling IDs and candidateIDs may be configured, and correspondence between the scrambling IDs andport signaling is configured through a DMRS port signaling table in thebase station. According to the ID selected for the terminal, a DMRS portconfiguration table in the base station, and the correspondence betweenscrambling IDs and candidate IDs, the base station may determine DMRSport signaling to be sent to the terminal. In step 202, the referencesignal initialization sequence generation indication sent to theterminal is the determined DMRS port signaling. Herein, similar to thatin the prior art, two scrambling IDs are included, that is, 0 and 1, andthe number of corresponding candidate IDs is also two. In the embodimentof the present invention, the scrambling IDs may be expanded. Forexample, the scrambling IDs are expanded to four, and the number ofcorresponding candidate IDs may also be four.

Alternatively, in the base station, correspondence between ID indicationidentifier values (that is, Y in subsequent specific embodiments) andcandidate IDs may be configured, and according to the ID selected forthe terminal and the correspondence between ID indication identifiervalues and candidate IDs, the base station determines an ID indicationidentifier value, and set the ID indication identifier value indedicated ID selection indication signaling. In step 202, the referencesignal initialization sequence generation indication sent to theterminal is the dedicated ID selection indication signaling in which theID indication identifier value is set. Herein, the dedicated IDselection indication signaling may be dynamic signaling, for example,new data indicator (NDI) signaling of a disabled transmission block(TB). Herein, two ID indication identifier values Y, for example, 0 and1, may be configured, and the number of corresponding candidate IDs isalso two. More than two ID indication identifier values Y may also beconfigured; for example, Y is expanded to four values, which are 00, 01,10, and 11, and the number of corresponding candidate IDs may also befour.

In another implementation manner, a formula for the base station togenerate a reference signal initialization sequence for the terminal is:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +n_(SCID)  Formula 4,

In Formula 4, n_(s) is a time slot number, X is a positive integergreater than or equal to 1, and n_(SCID) is a scrambling ID.

In Formula 4, a value of one of N_(ID1) and N_(ID2) may be 0, and theother is the ID used for generating the reference signal initializationsequence and selected for the terminal from the candidate IDs. It isalso acceptable that N_(ID1) and N_(ID2) are both IDs used forgenerating a reference signal initialization sequence and selected forthe terminal from the candidate IDs, that is, two IDs are selected forthe terminal from the candidate IDs, and the two IDs may be the same ordifferent.

Similar to the manner of the foregoing embodiment, the base station mayalso indicate the ID selected for the terminal to the terminal throughDMRS port signaling or dedicated ID selection indication signaling.However, correspondence, configured in the base station, between ascrambling ID or Y and an ID selected for the terminal is different. Forexample, when the candidate IDs include two IDs, namely, a Cell ID(which may specifically be a cell ID, an RRH ID, or a CSI-RS ID) and aGroup ID (which may specifically be a cell group ID, a terminal groupID, an RRH group ID, an antenna cluster ID, or a CSI-RS group ID), forthe manner of indication through the DMRS port signaling, the configuredcorrespondence may be:

$\begin{matrix}{{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = N_{ID}^{Group}}} \\{{n_{SCID} = 1},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}}\end{matrix}{or}$ $\begin{matrix}{{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}} \\{{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Group}}}\end{matrix}.$

For the manner of indication through the dedicated ID selectionindication signaling, the configured correspondence may be:

$\left\{ {\begin{matrix}{{Y = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}} \\{{Y = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Group}}}\end{matrix}\mspace{14mu} {or}\left\{ {\begin{matrix}{{Y = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = N_{ID}^{Group}}} \\{{Y = 1},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}}\end{matrix}.} \right.} \right.$

In yet another implementation manner, a formula for the base station togenerate a reference signal initialization sequence for the terminal is:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +ZN _(ID3) +n_(SCID)  Formula 5

n_(s) is a time slot number, Z is a positive integer greater than orequal to 1, and n_(SCID) is a scrambling ID.

In Formula 5, it is acceptable that N_(ID1) is a fixedly configured ID,where the fixedly configured ID is: a cell ID, an RRH ID, a cell groupID, an RRH group ID, a terminal group ID, a CSI-RS ID, a CSI-RS groupID, an antenna cluster ID, or a constant ID; and N_(ID3) is an IDselected by the base station for the terminal from third ID candidatevalues. The third ID candidate values include: a combination of any twoor any more than two of an RRH ID, a cell group ID, an RRH group ID, aterminal group ID, a CSI-RS ID, a CSI-RS group ID, an antenna clusterID, and one or more than one constant ID. The third ID candidate valuesmay also be two or more than two IDs in the form of constants. The basestation may semi-statically notify a UE of one or more of the third IDcandidate values through UE specific high-layer signaling, for example,through dedicated signaling in radio resource control (RRC) signaling.In this scenario, the base station may assign different third IDcandidate values to different UEs, and may also assign the samecandidate value of the third ID to different UEs. Alternatively, thethird ID candidate values include: two or more than two terminal grouprelated IDs, or the third ID candidate values include: two or more thantwo CSI-RS group related IDs, or the third ID candidate values include:two or more than two antenna cluster related IDs. In the latter threesituations, the base station may deliver parameter information forgenerating the ID candidate values to the terminal, for example, deliverthe parameter information for generating the ID candidate values to theterminal through the UE specific high-layer signaling. According to theparameter information and the same formula set in the base station andthe terminal, the base station and the terminal each generate two ormore than two IDs related to the parameter information. For example,when the sent parameter information is CSI-RS information, a generatedID is referred to as a CSI-RS related ID or a CSI-RS group related ID;when the sent parameter information is user group information, agenerated ID is referred to as a terminal group related ID; and whensent parameter information is antenna cluster information, a generatedID is referred to as an antenna cluster related ID. Alternatively, thethird ID candidate values may also be fixedly configured in the basestation or the terminal. Alternatively, the third ID candidate valuesmay also be a combination of the foregoing IDs in various possibleforms. For example, the third ID candidate values include one IDgenerated according to a parameter and an ID sent through high-layersignaling, or the third ID candidate values include one or two of thecandidate IDs, and further include one ID generated according to aparameter. Possible specific combination manners are not listed herein.

Similar to the manner of the foregoing embodiment, the base station mayalso indicate N_(ID3) selected for the terminal to the terminal throughDMRS port signaling or dedicated ID selection indication signaling.

Alternatively, in Formula 5, it is also acceptable that N_(ID3) is afixedly configured ID, where the fixedly configured ID is: a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, or a constant ID; andN_(ID1) is an ID selected for the terminal from first ID candidatevalues, where the first ID candidate values include: a combination ofany two or any more than two of the cell ID, the RRH ID, the cell groupID, the RRH group ID, the terminal group ID, the CSI-RS ID, the CSI-RSgroup ID, the antenna cluster ID, and one or more than one constant ID.

Similar to the manner of the foregoing embodiment, the base station mayalso indicate N_(ID1) selected for the terminal to the terminal throughDMRS port signaling or dedicated ID selection indication signaling.

Alternatively, in Formula 5, it is also acceptable that N_(ID1) is an IDselected for the terminal from first ID candidate values, where thefirst ID candidate values include: a combination of any two or any morethan two of a cell ID, an RRH ID, a cell group ID, an RRH group ID, aterminal group ID, a CSI-RS ID, a CSI-RS group ID, an antenna clusterID, or a constant ID; and N_(ID3) is an ID selected by the base stationfor the terminal from third ID candidate values, where the third IDcandidate values are the same as the third ID candidate values describedabove, which are not described herein again.

N_(ID1) and N_(ID3) may be indicated to the terminal through DMRS portsignaling and dedicated ID selection indication signaling.Correspondence between scrambling codes and the first ID candidatevalues (which may also be replaced with the third ID candidate values)and correspondence between Y and the third ID candidate values (whichmay also be replaced with the first ID candidate values as iscorresponding to the solution in the previous brackets) are set in thebase station. The base station determines a corresponding scramblingcode and ID indication identifier value according to the selectedN_(ID1) and N_(ID3) respectively, and further determines correspondingDMRS port signaling according to the scrambling code and a DMRS portconfiguration table, and then sends the determined DMRS port signalingand dedicated ID selection indication signaling which carries the IDindication identifier value.

Alternatively, the base station may also indicate N_(ID1) and N_(ID3) bycarrying two ID indication identifier values in dedicated ID selectionindication signaling. Correspondence between first ID indicationidentifier values and the first ID candidate values and correspondencebetween second ID indication identifier values and the third IDcandidate values are set in the base station, and a first ID indicationidentifier value and a second ID indication identifier value aredetermined according to the selected N_(ID1) and N_(ID3) respectively,and the first ID indication identifier value and the second IDindication identifier value are set in different specific informationelements or different specific bit positions in dedicated ID selectionindication signaling, and sent to the terminal.

Alternatively, in Formula 5, it is also acceptable that N_(ID1) andN_(ID3) are both fixedly configured IDs, and N_(ID1) and N_(ID3) may beconfigured into: any two different IDs or one same ID among a cell ID,an RRH ID, a cell group ID, an RRH group ID, a terminal group ID, aCSI-RS ID, a CSI-RS group ID, an antenna cluster ID, or a constant ID.

In yet another manner of the embodiment, a formula for the base stationto generate a reference signal initialization sequence for the terminalis:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +ZN _(ID3) +n_(SCID)  Formula 5

n_(s) is a time slot number, X and Z are both positive integers greaterthan or equal to 1, and n_(SCID) is a scrambling ID.

In Formula 6, it is acceptable that N_(ID1) is a fixedly configured ID,where the fixedly configured ID is: 0 or any one of a cell ID, an RRHID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID,a CSI-RS group ID, an antenna cluster ID, or a constant ID; N_(ID2) is afixedly configured ID, where the fixedly configured ID is: a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, or a constant ID; andN_(ID3) is an ID selected by the base station for the terminal fromthird ID candidate values, where the third ID candidate values are thesame as the third ID candidate values in the foregoing manner of theembodiment. Similar to the manner of the foregoing embodiment, the basestation may also indicate N_(ID3) selected for the terminal to theterminal through DMRS port signaling or dedicated ID selectionindication signaling.

In Formula 6, it is also acceptable that N_(ID3) is a fixedly configuredID, where the fixedly configured ID is: a cell ID, an RRH ID, a cellgroup ID, an RRH group ID, a terminal group ID, a CSI-RS ID, a CSI-RSgroup ID, an antenna cluster ID, or a constant ID; N_(ID1) is an IDselected for the terminal from first ID candidate values, where thefirst ID candidate values include: a combination of any two or any morethan two of the cell ID, the RRH ID, the cell group ID, the RRH groupID, the terminal group ID, the CSI-RS ID, the CSI-RS group ID, theantenna cluster ID, and one or more than one constant ID; and N_(ID2) isan ID selected for the terminal from second ID candidate values, wherethe second ID candidate values include: a combination of any two or anymore than two of the cell ID, the RRH ID, the cell group ID, the RRHgroup ID, the terminal group ID, the CSI-RS ID, the CSI-RS group ID, theantenna cluster ID, and one or more than one constant ID. The first IDcandidate values and the second ID candidate values may be the same ordifferent; likewise, the selected N_(ID1) and N_(ID2) may also be thesame or different.

Specifically, the base station may indicate N_(ID1) and N_(ID2) to theterminal through DMRS port signaling or dedicated ID selectionindication signaling respectively, and may also indicate N_(ID1) andN_(ID2) to the terminal by carrying two ID indication identifier valuesin dedicated ID selection indication signaling. A specificimplementation manner can be obtained with reference to the specificmanner in the foregoing embodiment of the present invention, which isnot described herein again.

Alternatively, in Formula 6, N_(ID1) is an ID selected for the terminalfrom first ID candidate values, where the first ID candidate values arethe same as the first ID candidate values described above; N_(ID2) is anID selected for the terminal from second ID candidate values, where thesecond ID candidate values are the same as the second ID candidatevalues described above; and N_(ID3) is an ID selected by the basestation for the terminal from third ID candidate values, where the thirdID candidate values are the same as the third ID candidate valuesdescribed above.

The terminal group related IDs are IDs generated by the network deviceaccording to indication information of a terminal set; the CSI-RS grouprelated IDs are IDs generated by the network device according to CSI-RSconfiguration information; the antenna cluster related IDs are IDsgenerated according to antenna cluster serial numbers; the RRH grouprelated IDs are IDs generated by the network device according to RRHserial numbers; and the terminal group related IDs are IDs generated bythe network device according to indication information of a terminalset. For a further implementation manner, reference is made to ExemplaryEmbodiment 7 of the method.

Specifically, the base station may indicate any one of N_(ID1), N_(ID2),and N_(ID3) through DMRS port signaling, and indicate the other twothrough two ID indication identifier values in dedicated ID selectionindication signaling, and the base station may also indicate N_(ID1),N_(ID2), and N_(ID3) through three ID indication identifier values indedicated ID selection indication signaling. The base station may alsoindicate N_(ID1), N_(ID2), and N_(ID3) through three pieces ofsignaling, namely, DMRS port signaling, first dedicated ID selectionindication signaling, and second dedicated ID selection indicationsignaling. Setting of a DMRS port configuration table and various kindsof correspondence involved in specific implementation are not describedherein again, and can be implemented with reference to theimplementation manners described above.

The implementation manners of the present invention are all applicableto a scenario where the base station schedules multiple terminals overthe same time-frequency resource. When the multiple terminals scheduledby the base station over the same resource include a terminal performingMU-MIMO, in step 101, the selecting, by the base station and fromcandidate IDs, an ID used for generating a reference signalinitialization sequence for a terminal includes: preferentiallyselecting, by the base station for the terminal performing MU-MIMO, anID used for generating a reference signal initialization sequence.

When the MU-MIMO terminal includes a CoMP terminal and a non-CoMPterminal, the base station preferentially selects, for the CoMPterminal, an ID used for generating a reference signal initializationsequence, and preferentially selects, for the non-CoMP terminal, an IDused for generating a reference signal initialization sequence the sameas that selected for the CoMP terminal.

When the MU-MIMO terminal includes multiple CoMP terminals, the basestation preferentially selects, for the multiple CoMP terminals, thesame ID used for generating a reference signal initialization sequence.

When the network device in FIG. 1 is a terminal, and when the terminalgenerates a reference signal initialization sequence, as shown in FIG.3, the following steps are specifically included.

Step 301: The terminal receives a reference signal initializationsequence generation indication from a base station.

Step 302: Select, from candidate IDs according to the receivedindication, an ID used for generating an initialization sequence, wherethe candidate IDs include at least two IDs, and the selected ID does notinclude a scrambling ID.

Step 303: Generate a reference signal initialization sequence accordingto the selected ID.

Configuration the same as that of the base station is performed in theterminal. That is, the same candidate IDs, correspondence betweenscrambling codes and the candidate IDs, correspondence between IDindication identifier values and the candidate IDs, and DMRS portsignaling table are configured, or a formula used for generating thecandidate IDs are further configured. Definitely, corresponding todifferent implementation manners, because contents configured in thebase station are different, specific contents configured in the terminalare also different.

In addition, after the terminal receives the reference signalinitialization sequence generation indication sent by the base station,corresponding to a base station side, according to a scrambling codeand/or an ID indication identifier value in the indication, as well asthe DMRS port signaling table and configured correspondence between thescrambling codes and the candidate IDs in the terminal, and/or thecorrespondence between the ID indication identifier values and thecandidate IDs in the terminal, the terminal determines an ID used forgenerating a reference signal initialization sequence and selected bythe base station for the terminal. Because the ID is determined byadopting configuration and correspondence the same as those of the basestation, the determined ID used for generating a reference signalinitialization sequence is definitely the same as that of the basestation, so that the base station and the terminal both can generate thesame demodulation reference signal based on the reference signalinitialization sequence.

Exemplary Embodiment 1

As shown in FIG. 4, it is a flow chart of Exemplary Embodiment 1 of thepresent invention. In this embodiment, a base station selects, for aterminal and from a first ID (Cell ID) and a second ID (Group ID), an IDfor generating a reference signal initialization sequence, and indicatesthe ID to the terminal. The terminal selects, from the first ID and thesecond ID and according to the indication of the base station, an ID forgenerating a reference signal initialization sequence.

When the base station schedules multiple terminals over the sametime-frequency resource, a procedure of this embodiment is triggered.The procedure of this embodiment specifically includes:

Step 401: For the multiple terminals scheduled over the sametime-frequency resource, the base station determines IDs used forgenerating a reference signal initialization sequence, and determinesspread spectrum sequences.

Formula 1 shows a manner of generating a reference signal initializationsequence provided in this embodiment. It can be seen that, in thisembodiment, the base station may select one ID from the first ID and thesecond ID to generate a reference signal initialization sequence.

$\begin{matrix}{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + n_{SCID}}}\left\{ \begin{matrix}{{n_{SCID} = 0},} & {N_{ID} = N_{ID}^{Cell}} \\{{n_{SCID} = 1},} & {N_{ID} = N_{ID}^{Group}}\end{matrix} \right.} & {{Formula}\mspace{14mu} 7}\end{matrix}$

n_(SCID) is used by the base station for indicating which ID theterminal should select to generate a reference signal initializationsequence, that is, what the value of N_(ID) is, and physical quantitiesrepresented by the remaining parameters are the same as those in theprior art. (In specific implementation, the parameters may also be setas

$\begin{matrix}{{n_{SCID} = 1},} & {N_{ID} = N_{ID}^{Cell}} \\{{n_{SCID} = 0},} & {N_{ID} = N_{ID}^{Group}}\end{matrix},$

which is an equivalent replacement of this implementation manner, andparameters used for indicating ID selection involved in the followingimplementation manners are all similar, and may be equivalently replacedthrough replacement of the indication manner.)

The Cell ID is a cell ID of a cell where the terminal is located, and aremote radio head (RRH) ID (in a scenario where an RRH ID exists), or aCSI-RS ID. The Group ID may be a cell group ID, a terminal group ID, aCSI-RS group ID, or an RRH group ID.

The CSI-RS ID is an ID generated according to channel state informationreference symbol (CSI-RS) configuration information. The CSI-RSconfiguration information is a piece of CSI-RS configuration informationthat is notified by the base station to the terminal. Correspondence(for example, N_(ID) ^(Cell)=F(N_(CSI-RS) ¹,C_(CSI-RS) ¹,I_(CSI-RS) ¹))is established between the number (N_(CSI-RS) ¹) of antenna ports of anon-zero power CSI-RS and/or reference signal pattern configuration(C_(CSI-RS) ¹) and/or subframe configuration (I_(CSI-RS) ¹) in CSI-RSparameters and a CSI-RS ID, so that the base station and the terminalcan determine a CSI-RS ID according to the number of antenna ports ofone non-zero power CSI-RS and/or reference signal pattern configurationand/or subframe configuration.

Cell groups may be obtained through static division according toregions. For example, M cells in a certain large geographical area aredivided into N cell groups, each cell group includes multiple cells, andthe N cell groups may overlap or may not overlap. Alternatively, in asituation where a macro cell and a micro cell exist, a macro cell and amicro cell within a coverage range of the macro cell are grouped intoone group.

Cell groups may also be obtained through dynamic division with respectto terminals. For example, in a situation where a CoMP terminal exists,the base station groups multiple cells participating in CoMPcoordination for the terminal into one group.

The ID of a cell group may be the same as the ID of a cell in the cellgroup. For example, when determining the cell group ID, the base stationmay determine the cell group ID as a cell ID of any one cell other thanthe current cell, that is, a cell ID that is different from the Cell IDdetermined by the base station and among cell IDs. The base station mayalso determine an ID of a serving cell (the Serving Cell is a cell thatsends scheduling signaling) of a CoMP terminal as the cell group ID. Ina situation where multiple CoMP terminals exist, the base station mayuse an ID of a serving cell of any one CoMP terminal scheduled over thesame time-frequency resource as a cell group ID of the multiple CoMPterminals. In a situation where a macro cell and a micro cell in acoverage range of the macro cell are grouped into one group, the basestation may also determine an ID of the macro cell as the cell group ID.

The ID of the cell group may also be different from any cell ID in thecell group, but may be the same as a cell ID in other cell groups. Forexample, the cell group is statically configured with a cell ID of anyone of the other cell groups.

The ID of the cell group may also be different from any cell ID in thecell group. For example, a value of a cell ID is in a range from 0 to N,and a value of a cell group ID may be from N+1 to M, where M is apositive integer greater than N+1.

In a situation where a CoMP terminal exists in a scenario of MU-MIMO,the base station preferentially adopts any one of the last two mannersto configure a cell group ID.

In a static manner, a cell group ID of a cell involved in a coveragerange of the base station is saved in the base station. When theterminal accesses the base station from a cell in a certain cell group,the base station determines a corresponding cell group ID and saves thecell group ID for the terminal (in a situation where only one cell isincluded in the coverage range of the base station, the two steps, thatis, the determination and saving steps, may be omitted), and sends thecell group ID to the terminal. The terminal saves the cell group ID as aGroup ID.

A terminal group is obtained when a base station maps already accessedterminals in a cell to multiple groups, which may be static mappingherein. For example, the base station groups terminals scheduled overcertain time-frequency resources into one group, assigns a terminalgroup ID to the group, and sends the assigned terminal group ID to theterminals, for example, UE specific high-layer signaling, and theterminals save the terminal group ID as a Group ID.

A CSI-RS group is obtained when a base station groups terminals havingthe same channel state information reference symbol (CSI-RS)configuration information into one group. The CSI-RS configurationinformation may be one piece of CSI-RS configuration information or oneof multiple pieces of CSI-RS configuration information notified by thebase station to a terminal. Correspondence (for example, N_(ID)^(Group)=F(N_(CSI-RS) ¹,C_(CSI-RS) ¹,I_(CSI-RS) ¹), where the functionherein may be the same as or different from the function for generatinga CSI-RS ID) is established between the number (N_(CSI-RS) ¹) of antennaports of a non-zero power CSI-RS and/or reference signal patternconfiguration (C_(CSI-RS) ¹) and/or subframe configuration (I_(CSI-RS)¹) in CSI-RS parameters and a CSI-RS group ID, so that the base stationand the terminal can determine a CSI-RS group ID according to the numberof antenna ports of one non-zero power CSI-RS and/or reference signalpattern configuration and/or subframe configuration. The CSI-RSconfiguration information may also be multiple pieces of CSI-RSconfiguration information among the multiple pieces of CSI-RSconfiguration information that are notified by the base station to theterminal. Taking two pieces of CSI-RS configuration information as anexample, correspondence (for example, N_(ID) ^(Group)=F(N_(CSI-RS)¹,C_(CSI-RS) ¹,I_(CSI-RS) ¹,N_(CSI-RS) ²,C_(CSI-RS) ²,I_(CSI-RS) ², . .. )) may be established between the numbers (N_(CSI-RS) ¹,N_(CSI-RS) ²)of antenna ports of non-zero power CSI-RSs and/or reference signalpattern configuration (N_(CSI-RS) ¹,C_(CSI-RS) ¹) and/or subframeconfiguration (I_(CSI-RS) ¹,I_(CSI-RS) ¹) in CSI-RS parameters and aCSI-RS group ID, so that the base station and the terminal can determinea CSI-RS group ID according to the numbers of antenna ports of multiplenon-zero power CSI-RSs and/or reference signal pattern configurationand/or subframe configuration. After determining a CSI-RS group ID inthe above manner, the base station and the terminal each save the CSI-RSgroup ID as a Group ID corresponding to the terminal.

An RRH group is obtained when multiple RRHs in a cell of a base stationare divided into multiple groups, where RRHs having the sameconfiguration are grouped into one group, and the base station assignsan RRH group ID to each group of RRHs. When a terminal accesses the basestation through an RRH, the base station determines a corresponding RRHgroup ID, saves the RRH group ID for the terminal, and sends the RRHgroup ID to the terminal, and the terminal saves the RRH group ID as aGroup ID.

When for terminals, IDs used for generating a reference signalinitialization sequence are determined and spread spectrum sequences aredetermined, the same ID and different spread spectrum sequences arepreferred, and different IDs are less preferred. A specific manner is asfollows:

If the base station schedules multiple terminals over the sametime-frequency resource, the total number of layers of the multipleterminals is x, and multiple terminal pairing is not performed betweenthe terminals. First, a relationship between the total number x oflayers of these terminals and the number y of selectable orthogonalspread spectrum sequences of the base station is determined. If x isless than or equal to y, one ID is selected, the ID is assigned to theseterminals, and different spread spectrum sequences orthogonal to eachother are assigned to the layers of these terminals. If x is greaterthan y, these terminals are divided into groups according to degrees ofinterference, and the total number of layers of terminals in each groupis less than or equal to y. For example, the terminals are divided intoa first group of terminals (x1, x2, and x3) and a second group ofterminals (x4, x5, and x6), and a total of N terminal groups areobtained by analogy. The grouping principle may also be groupingaccording to CSI-RS configuration, so that all terminals in a group areassigned with the same ID, layers of ports adopt different spreadspectrum sequences orthogonal to each other, and different groups adoptdifferent IDs. When the number of configurable IDs is M and N>M,terminal groups having small interference with each other may adopt thesame ID, and groups having great interference with each other adoptdifferent IDs as much as possible.

If multiple terminal paring (MU-MIMO) is performed by terminals amongthe multiple terminals scheduled by the base station over the sametime-frequency resource, the total number z of layers (layer) of pairedterminals is determined (for example, when two terminals adopting twolayers of ports are paired, the total number of layers is 4). If z isless than or equal to the length m of a spread spectrum sequence of thebase station, reference signal ports corresponding to each layer adoptthe same ID and adopt spread spectrum sequences orthogonal to eachother. Herein, if the paired terminals include a CoMP terminal, theadopted ID is determined according to the CoMP terminal; otherwise,reference signal ports corresponding to paired layers are divided into Ngroups, the same ID is adopted in each group, and orthogonal spreadspectrum sequences are adopted. An assignment principle for the group isthe same as that described above, different IDs are used for the groups,and the IDs may be scrambling IDs.

For example, terminal 1 and terminal 2 that perform MU-MIMO adopt twolayers of ports. In a situation of Table 1 or Table 2, the total numberof spread spectrum sequences is 2, so that the total number of layers 4is greater than the total number of the spread spectrum sequences 2. ACell ID and a Group ID are selected for terminal 1 and terminal 2respectively, and ports of the layers are configured into port 7 andport 8, that is, port 7 [1, 1] and port 8 [1, −1] are selected as spreadspectrum sequences.

In a situation of Table 3 below, the total number of spread spectrumsequences is 4, and the total number of layers 4 is equal to the totalnumber of spread spectrum sequences 4, so that the same ID may beselected for terminal 1 and terminal 2. If terminal 1 herein is a CoMPterminal and terminal 2 is a non-CoMP terminal, the selected ID isdetermined according to terminal 1, for example, if a Group ID isselected, and the Group ID is also selected for terminal 2. Orthogonalspread spectrum sequences are selected for terminal 1 and terminal 2,for example, port 7 [1, 1, 1, 1], port 8 [1, −1, 1, −1], port 11 [1, 1,−1, −1], and port 13 [1,−1,−1,1] are selected.

Step 402: According to an ID and a spread spectrum sequence selected foreach terminal, the base station sends a reference signal initializationsequence generation indication to the terminal.

Specifically, the base station sends the reference signal initializationsequence generation indication to the terminal through signaling thatindicates a DMRS port and is in downlink scheduling signaling.

The base station may determine, based on a preconfigured portconfiguration table, which DMRS port signaling is to be adopted todeliver the reference signal initialization sequence generationindication to the terminal. The port configuration table may be in theform of Table 1, Table 2, or Table 3 below.

TABLE 1 One codeword: Two codeword: Codeword 0 enabled. Codeword 0enabled. Codeword 1 disabled. Codeword 1 enabled. Message Message 0 1layer, port 7, SCID = 0 0 2 layers, port 7-8, SCID = 0 1 1 layer, port7, SCID = 1 1 2 layers, port 7-8, SCID = 1 2 1 layer, port 8, SCID = 0 23 layers, port 7-9, SCID = 0 3 1 layer, port 8, SCID = 1 3 4 layers,port 7-10, SCID = 0 4 2 layer, port 7-8, SCID = 0 4 5 layers, port 7-11,SCID = 0 5 3 layer, port 7-9, SCID = 0 5 6 layers, port 7-12, SCID = 0 64 layer, port 7-10, SCID = 0 6 7 layers, port 7-13, SCID = 0 7 reserved7 8 layers, port 7-14, SCID = 0

TABLE 2 One codeword: Two codeword: Codeword 0 enabled. Codeword 0enabled. Codeword 1 disabled. Codeword 1 enabled. Message Message 0 1layer, port 7, SCID = 0 0 2 layers, port 7-8, SCID = 0 1 1 layer, port7, SCID = 1 1 2 layers, port 7-8, SCID = 1 2 1 layer, port 8, SCID = 0 23 layers, port 7-9, SCID = 0 3 1 layer, port 8, SCID = 1 3 3 layers,port 7-9, SCID = 1 4 2 layer, port 7-8, SCID = 0 4 4 layers, port 7-10,SCID = 0 5 2 layer, port 7-8, SCID = 1 5 4 layers, port 7-10, SCID = 1 63 layer, port 7-9, SCID = 0 6 5 layers, port 7-11, SCID = 0 7 3 layer,port 7-9, SCID = 1 7 5 layers, port 7-11, SCID = 1 8 4 layer, port 7-10,SCID = 0 8 6 layers, port 7-12, SCID = 0 9 4 layer, port 7-10, SCID = 19 6 layers, port 7-12, SCID = 1 reserved 10 7 layers, port 7-13, SCID =0 11 7 layers, port 7-13, SCID = 1 12 8 layers, port 7-14, SCID = 0 13 8layers, port 7-14, SCID = 1

Based on Table 1 or Table 2, in the example provided in the previousstep that terminal 1 and terminal 2 perform MU-MIMO, in this step, thebase station instruct, through 0 and 1 in two-codeword signaling,terminal 1 and terminal 2 to generate a reference signal initializationsequence.

The base station may also determine, based on Table 3 below, which DMRSport signaling is to be adopted to deliver the reference signalinitialization sequence generation indication to the terminal.

TABLE 3 One Codeword: Codeword 0 enabled, Codeword 1 disabled Message 01 layer, port 7, SCID = 0, OCC = 4 1 1 layer, port 7, SCID = 1, OCC = 42 1 layer, port 8, SCID = 0, OCC = 4 3 1 layer, port 8, SCID = 1, OCC =4 4 1 layer, port 11, SCID = 0, OCC = 4 5 1 layer, port 11, SCID = 1,OCC = 4 6 1 layer, port 13, SCID = 0, OCC = 4 7 1 layer, port 13, SCID =1, OCC = 4

Based on Table 3, in the example provided in the previous step that CoMPterminal 1 and non-CoMP terminal 2 perform MU-MIMO, in this step, thebase station instruct, through 1 and 3 in one-codeword signaling,terminal 1 and terminal 2 to generate a reference signal initializationsequence.

In this step, specific spread spectrum sequences corresponding to portsin the tables may be determined with reference to a standard protocolabout LTE, which are not listed herein one by one.

Step 403: After receiving DMRS port signaling sent by the base station,the terminal determines, according to the port signaling, a spreadspectrum sequence and an ID for generating a reference signalinitialization sequence.

The terminal preconfigures a port configuration table the same as thatof the base station side. Based on the port configuration table and thereceived DMRS port signaling, the terminal determines the ID used forgenerating the reference signal initialization sequence, and determinesthe spread spectrum sequence.

When determining the ID used for generating the reference signalinitialization sequence, the terminal first determines a scrambling IDvalue according to the DMRS port signaling, and then determines acorresponding ID according to the scrambling ID value and correspondencebetween scrambling ID values and IDs. In this embodiment, thecorrespondence between scrambling ID values and IDs is described in amanner of parameters in a formula, and in specific implementation,various configuration manners of correspondence may be, for example, alist.

Step 404: The terminal generates a reference signal initializationsequence according to the determined ID, and generates a demodulationreference signal based on the reference signal initialization sequenceand the spread spectrum sequence.

In this embodiment, the base station may also generate a referencesignal initialization sequence according to the ID selected for theterminal, and further generate a demodulation reference signal based onthe reference signal initialization sequence and the spread spectrumsequence. In this step, the terminal also adopts an algorithm the sameas that of the base station, and generates the reference signalinitialization sequence and the demodulation reference signal accordingto the ID indicated by the base station through the DMRS port signaling.

When generating the demodulation reference signal, the terminal and thebase station may generate a DMRS sequence of a corresponding lengthaccording to a maximum system bandwidth, as shown in Formula 8:

$\begin{matrix}{{r(m)} = {{\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {2\; m} \right)}}} \right)} + {j\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {{2\; m} + 1} \right)}}} \right)}}} & {{Formula}\mspace{14mu} 8}\end{matrix}$

In Formula 8, m is determined through Formula 9:

$\begin{matrix}{m = \left\{ \begin{matrix}{0,1,\ldots \mspace{14mu},{{12\; N_{RB}^{\max,{DL}}} - 1}} & {{normal}\mspace{14mu} {cyclic}\mspace{14mu} {prefix}} \\{0,1,\ldots \mspace{14mu},{{16\; N_{RB}^{\max,{DL}}} - 1}} & {{extended}\mspace{14mu} {cyclic}\mspace{14mu} {prefix}}\end{matrix} \right.} & {{Formula}\mspace{14mu} 9}\end{matrix}$

Physical quantities represented by parameters in Formula 8 and Formula 9are the same that those in the prior art.

In Formula 9, N_(RB) ^(max,DL) is the number of resource blocks includedin the maximum system bandwidth among all system bandwidths, and for LTEand LTE-A, the maximum system bandwidth is 20 M, and the number ofeffective resource blocks included in the maximum system bandwidth is100. N_(RB) ^(1,DL), N_(RB) ^(2,DL), and N_(RB) ^(3,DL), are the numbersof effective resource blocks included in system bandwidths other thanthe maximum system bandwidth, where N_(RB) ^(1,DL)>N_(RB) ^(2,DL)>N_(RB)^(3,DL). For the LTE and the LTE-A, N_(RB) ^(1,DL), is the number ofeffective resource blocks corresponding to a 10 M system bandwidth andis 50, N_(RB) ^(2,DL), is the number of effective resource blockscorresponding to a 5 M system bandwidth and is 25, and N_(RB) ^(3,DL),is the number of effective resource blocks corresponding to a 1.4 Msystem bandwidth and is 6. For different system bandwidths, DMRSsequences of corresponding lengths are cut off from a longest sequence,and the cutting process is shown in FIG. 4, that is, a reference signalsequence in each system bandwidth is a sequence of a correspondinglength cut off from a longest sequence with central subcarriers alignedto each other.

In this embodiment, because the base station may adopt two IDs, namely,the Group ID and the Cell ID, to generate reference signalinitialization sequences for terminals using the same time-frequencyresource, a demodulation reference signal sequence configuring methoddifferent from the prior art is provided.

In addition, in the existing LTE-A, if the terminal is a coordinatedmulti-point (CoMP) terminal, the terminal may receive downlink data sentfrom multiple cells, and the multiple cells need to configure the samedemodulation reference signal sequence for the terminal according to ajoint transmission ID, so that the terminal can correctly performreceiving and demodulation. If the terminal is a non-CoMP terminal, DMRSconfiguration is performed only according to a cell ID of the currentcell. When the CoMP terminal and the non-CoMP terminal perform multipleuser multiple-input multiple-output (MU-MIMO) signal transmission, if aDMRS sequence adopted by CoMP terminal 1 is configured according to thejoint transmission ID, a DMRS terminal adopted by Non-CoMP terminal 2 isconfigured according to the ID of the current cell, and the two DMRSsequences are different, terminal 1 and terminal 2 cannot performorthogonal pairing, and the performance of the terminals are influenced.

In the solution of this embodiment, according to the ID adopted by theCoMP terminal, the base station may select, from the Group ID and theCell ID and for the non-CoMP terminal performing MU-MIMO with the CoMPterminal, an ID used for generating a reference signal initializationsequence, so that the CoMP terminal and the non-CoMP terminal cansuccessfully perform orthogonal pairing, thereby improving theperformance of the terminals.

Moreover, in a scenario where an RRH does not have an ID, RRHs aredivided into groups in this embodiment, and when terminals that getaccess through RRHs in different groups uses the same time-frequencyresource, the terminals may adopt different Group IDs, or may adopt theGroup ID and the Cell ID respectively to avoid interference, so that thecapacity of the base station is expanded in the scenario where an RRHdoes not have an ID.

Exemplary Embodiment 2

In this embodiment, dedicated ID selection indication signaling is used,so as to instruct a terminal to determine an ID used for generating areference signal initialization sequence, and a scrambling ID is notused for instruction, so that the terminal may adopt the same ID anddifferent scrambling IDs to generate a reference signal initializationsequence.

Except the following differences, the remaining technical implementationsolutions of this embodiment and Embodiment 1 are the same.

(1) In this embodiment, in step 401, in addition to an ID used forgenerating a reference signal initialization sequence and a spreadspectrum sequence, parameters used for generating a demodulationreference signal and determined by the base station for the terminalfurther include a scrambling ID used for generating a reference signalinitialization sequence. Correspondingly, when the base stationdetermines a demodulation reference signal generating manner for xterminals scheduled over the same time-frequency resource, the number oflayers of terminals which adopt the same ID is doubled, compared withthe previous embodiment, by adopting different scrambling IDs.Meanwhile, compared with a manner of determining a reference signalinitialization sequence by adopting a cell ID in the prior art, thenumber of layers of terminals that can be scheduled by the base stationover the same time-frequency resource is also doubled.

In specific selection, preferably, layers of ports of the terminalsadopt the same ID, the same scrambling ID, and orthogonal spreadspectrum sequences; less preferably, adopt the same ID, orthogonalspread spectrum sequences, and another scrambling ID, or another ID, thesame spread spectrum sequence, and the same scrambling ID or differentscrambling IDs; and the least preferably, adopt another ID, otherselectable spread spectrum sequences, and the same scrambling ID ordifferent scrambling IDs. A further selection manner, for example, aselection manner in a scenario where terminals perform MU-MIMO and aCoMP terminal is involved, can be implemented with reference toEmbodiment 1.

For example, for the scenario in the previous embodiment where CoMPterminal 1 and non-CoMP terminal 2 perform MU-MIMO and the portsignaling table is Table 3, the ID used for generating the referencesignal initialization sequence and determined by the base station forterminal 1 and terminal 2 is the Group ID, the spread spectrum sequencesare port 7 [1, 1, 1, 1] and port 8 [1, −1, 1, −1] (which may also beother orthogonal spread spectrum sequences), and the scrambling ID is 0(which may definitely also be 1).

(2) A different formula for generating an initialization sequence and adifferent manner of indicating an initialization sequence are adopted.

An initialization sequence formula is:

$\begin{matrix}{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + n_{SCID}}}\left\{ \begin{matrix}{{Y = 0},{N_{ID} = N_{ID}^{Cell}},{n_{SCID} = 0}} \\{{Y = 0},{N_{ID} = N_{ID}^{Cell}},{n_{SCID} = 1}} \\{{Y = 1},{N_{ID} = N_{ID}^{Group}},{n_{SCID} = 0}} \\{{Y = 1},{N_{ID} = N_{ID}^{Group}},{n_{SCID} = 1}}\end{matrix} \right.} & {{Formula}\mspace{14mu} 10}\end{matrix}$

In the formula, Y is a parameter indicating which ID is to be selected.In the formula, when Y=0, it indicates that a Cell ID is selected, andwhen Y=1, it indicates that a Group ID is selected. A value of Y is sentto the terminal by the base station through dedicated ID selectionindication signaling. The dedicated ID selection indication signalingmay be dynamic signaling, for example, an NDI of a TB is used forindication.

In this embodiment, a manner of generating a demodulation referencesignal is jointly indicated through DMRS port signaling (that is, theDMRS port signaling is used for indicating a scrambling ID and a spreadspectrum sequence, and specific implementation can be obtained withreference to the previous embodiment) and dedicated ID selectionindication signaling.

After receiving the DMRS port signaling and the dedicated ID selectionindication signaling, the terminal determines the value of Y accordingto the dedicated ID selection indication signaling, and then determinesthe ID used for generating the reference signal initialization sequence,and determines, according to the DMRS port signaling, a spread spectrumsequence used for generating a demodulation reference signal, and ascrambling ID. Afterwards, according to the ID, the spread spectrumsequence, and the scrambling ID, the terminal generates a demodulationreference signal according to a formula the same as that of the basestation. For example, when the base station indicates that Y=0, whenDMRS port signaling indicated in a One codeword mode shown in Table 1 inthe port signaling table is 0, according to the value of Y andcorrespondence between Y and IDs that is configured in the terminal, theterminal determines that the cell ID is adopted and port 7 [1, 1] isadopted as the spread spectrum sequence, where n_(SCID)=0.

In this embodiment, based on all the effects of Embodiment 1, thededicated ID selection indication signaling is adopted to indicate theID used for generating the reference signal initialization sequence tothe terminal, so that the scrambling ID adopted by the terminal may beindicated through the DMRS port signaling, that is, the base station mayindicate different scrambling IDs to terminals adopting the same ID andthe same spread spectrum sequence. Compared with both the prior art andEmbodiment 1, the number of layers of terminals scheduled by the basestation over the same time-frequency resource is increased.

Exemplary Embodiment 3

The difference between this embodiment and Embodiment 1 only lies inthat a different formula for generating an initialization sequence isadopted (a parameter correspondence table, that is, correspondencebetween scrambling IDs and IDs used for generating a reference signalinitialization sequence, is also different from that in Embodiment 1).In this embodiment, a formula for generating an initialization sequenceis:

$\begin{matrix}{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{{ID}\; 1}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ {{\begin{matrix}{{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}} \\{{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Group}}}\end{matrix}{or}},} \right.} & {{Formula}\mspace{14mu} 11} \\{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{{ID}\; 1}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ \begin{matrix}{{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = 0}} \\{{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Cell}}}\end{matrix} \right.} & {{Formula}\mspace{14mu} 12}\end{matrix}$

In the formula, X is a positive integer greater than or equal to 1. Forexample, the value of X may be:

${2 \leq X \leq \frac{2^{16}}{\max \left( {\Phi \left( N_{{ID}\; 2} \right)} \right)}},$

where Φ(N_(ID2)) is a set of candidate IDs, max(d(N_(ID2))) is a maximumID in the set of candidate IDs, and X=2^(M).

The remaining involved overall implementation steps of the embodimentand specific implementation manners of the steps are all the same asthose in Embodiment 1, which are not described herein again.

Exemplary Embodiment 4

This embodiment is basically the same as Embodiment 2, and thedifference only lies in that a different formula for generating areference signal initialization sequence is adopted (a parametercorrespondence table, that is, correspondence between Y and IDs used forgenerating a reference signal initialization sequence, is also differentfrom that in Embodiment 2). In this embodiment, the formula forgenerating a reference signal initialization sequence is:

$\begin{matrix}{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ {{\begin{matrix}{{Y = 0},} & {{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}} \\{{Y = 1},} & {{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Group}}} \\{Y = 0} & {{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}} \\{Y = 1} & {{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Group}}}\end{matrix}{or}},} \right.} & {{Formula}\mspace{14mu} 13} \\{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ \begin{matrix}{{Y = 0},} & {{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = 0}} \\{{Y = 1},} & {{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Cell}}} \\{Y = 0} & {{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = 0}} \\{Y = 1} & {{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},{N_{{ID}\; 2} = N_{ID}^{Cell}}}\end{matrix} \right.} & {{Formula}\mspace{14mu} 14}\end{matrix}$

In Formula 13 and Formula 14, a manner of assigning a value to X is thesame as that in Embodiment 3, and meanings of the remaining physicalparameters are the same as those in Embodiment 2.

The remaining involved overall implementation steps of the embodimentand specific implementation manners of the steps are all the same asthose in Embodiment 2, which are not described herein again.

Exemplary Embodiment 5

Except the following differences, the remaining technical implementationsolutions of this embodiment and Embodiment 1 are the same.

(1) A different formula for generating a reference signal initializationsequence is adopted (a parameter correspondence table, that is,correspondence between scrambling IDs and IDs used for generating areference signal initialization sequence, is also different from that inEmbodiment 1). In this embodiment, the formula for generating areference signal initialization sequence is:

$\begin{matrix}{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ {{\begin{matrix}{{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = N_{ID}^{Cell}}} \\{{n_{SCID} = 1},} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = 0}}\end{matrix}{or}},} \right.} & {{Formula}\mspace{14mu} 15} \\{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{{ID}\; 1}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ \begin{matrix}{{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = N_{ID}^{Group}}} \\{{n_{SCID} = 1},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}}\end{matrix} \right.} & {{Formula}\mspace{14mu} 16}\end{matrix}$

(2) In Embodiment 1, when the base station determines, for x terminalsscheduled at the same time-frequency, a manner of generating a referencesignal initialization sequence, a situation where a Cell ID (Formula 11is adopted) or a situation where a Group ID (Formula 12 is adopted) isselected is replaced with a situation where a Group ID and a Cell ID areselected.

The remaining involved overall implementation steps of the embodimentand specific implementation manners of the steps are all the same asthose in Embodiment 1, which are not described herein again.

Exemplary Embodiment 6

Except the following differences, the remaining technical implementationsolutions of this embodiment and Embodiment 2 are the same.

(1) A different formula for generating a reference signal initializationsequence is adopted (a parameter correspondence table, that is,correspondence between values of Y and IDs used for generating areference signal initialization sequence, is also different from that inEmbodiment 2). In this embodiment, the formula for generating areference signal initialization sequence is:

$\begin{matrix}{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ {\begin{matrix}{{Y = 0},} & {n_{SCID} = 0} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = N_{ID}^{Cell}}} \\{Y = 0} & {n_{SCID} = 1} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = N_{ID}^{Cell}}} \\{{Y = 1},} & {{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Group}},{N_{{ID}\; 2} = 0}} \\{{Y = 1},} & {{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},N_{ID}^{Group},{N_{{ID}\; 2} = 0}}\end{matrix},{or},} \right.} & {{Formula}\mspace{14mu} 17} \\{{c_{init} = {{\left( {\left\lfloor {n_{s}/2} \right\rfloor + 1} \right) \cdot \left( {{2\; N_{ID}} + 1} \right) \cdot 2^{16}} + {XN}_{{ID}\; 2} + n_{SCID}}}\left\{ {\begin{matrix}{{Y = 0},} & {n_{SCID} = 0} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = N_{ID}^{Group}}} \\{Y = 0} & {n_{SCID} = 1} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = N_{ID}^{Group}}} \\{{Y = 1},} & {{n_{SCID} = 0},} & {{N_{{ID}\; 1} = N_{ID}^{Cell}},{N_{{ID}\; 2} = 0}} \\{{Y = 1},} & {{n_{SCID} = 1},} & {{N_{{ID}\; 1} = 0},N_{ID}^{Cell},{N_{{ID}\; 2} = 0}}\end{matrix},} \right.} & {{Formula}\mspace{14mu} 18}\end{matrix}$

A manner of assigning a value to X is the same as that in Embodiment 3,and meanings of the remaining physical parameters are the same as thosein Embodiment 2.

(2) In Embodiment 2, when the base station determines a manner ofgenerating a reference signal initialization sequence for x terminalsscheduled at the same time-frequency, a situation where a Cell ID(Formula 13 is adopted) or a situation where a Group ID (Formula 14 isadopted) is selected is replaced with a situation where a Cell ID and aGroup ID are selected.

The remaining involved overall implementation steps of the embodimentand specific implementation manners of the steps are all the same asthose in Embodiment 2, which are not described herein again.

Exemplary Embodiment 7

In this embodiment, a formula for generating a reference signalinitialization sequence and a manner of sending parameters involved inthe formula are different from those in the foregoing embodiment:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +ZN _(ID3) +n_(SCID)  Formula 19

In the formula, N_(ID1) may be fixedly configured into the Cell ID orthe Group ID, and may also be selectively configured into the Cell ID orthe Group ID, and a manner of selective configuration may be implementedin a manner of delivery through the port signaling in Embodiment 1 ordelivery through the dedicated ID selection indication signaling inEmbodiment 2; Z is a positive integer greater than or equal to 1, and avalue of Z may be, for example,

${2 \leq Z \leq \frac{2^{16}}{\max \left( {\Phi \left( N_{{ID}\; 2} \right)} \right)}},$

where Φ(N_(ID2)) is a set of candidate IDs, max(Φ(N_(ID2))) is a maximumID in the set of candidate IDs, and Z=2^(M); and N_(ID3) is a third ID.

In this embodiment, before the procedure shown in FIG. 3 is performed,the base station notifies one or more of candidate values of the thirdID to the terminal. If the base station notifies one candidate value ofthe third ID to the terminal, the base station and the terminal use thecandidate value of the third ID as the third ID. In this situation, amanner of selective configuration is adopted for N_(ID1); otherwise, ifthe base station notifies multiple candidate values of the third ID tothe terminal, a manner of selective configuration may be adopted forN_(ID1), and a manner of fixed configuration may also be adopted.

The base station semi-statically notifies one or more of the candidatevalues of the third ID to the terminal through terminal specifichigh-layer signaling, for example, through dedicated signaling in radioresource control (RRC) signaling. The base station may assign differentcandidate values of the third ID to different terminals scheduled overthe same time-frequency resource, and may also assign the same candidatevalue of the third ID to different terminals. The candidate values ofthe third ID herein are different from the Cell ID or the Group IDmentioned in the foregoing embodiment, and may also be the same as theCell ID or the Group ID mentioned in the foregoing embodiment.

Alternatively

The base station may notify one or more of the candidate values of thethird ID to the terminal in an implicit manner. The implicit mannerrefers to that a candidate value of the third ID is generated accordingto information known by both the base station and the terminal. Theinformation known by both the base station and the terminal may be oneor more of pieces of CSI-RS configuration information or one or more ofRRH serial numbers or indication information of a user set. In thiscase, the base station does not need to notify the candidate value ofthe third ID to the terminal through additional signaling, and theterminal may learn the candidate value of the third ID by using theknown information. Specifically, in an implementation manner, thecandidate value of the third ID is generated according to one piece ofCSI-RS configuration information, where the CSI-RS configurationinformation may be one piece of CSI-RS configuration information or oneof multiple pieces of CSI-RS configuration information notified by thebase station to the terminal. The base station and the terminalestablish correspondence (for example, N_(ID3)=F(N_(CSI-RS) ¹,C_(CSI-RS)¹,I_(CSI-RS) ¹); herein, when one CSI-RS group related ID needs to bedetermined, a specific function adopted may be the same as the functionfor generating a CSI-RS ID or a CSI-RS group ID in Exemplary Embodiment1, and when more than one CSI-RS group related ID needs to be generated,a specific function is different from the function in Embodiment 1)between the number (N_(CSI-RS) ¹) of antenna ports of a non-zero powerCSI-RS and/or reference signal pattern configuration (C_(CSI-RS) ¹)and/or subframe configuration (I_(CSI-RS) ¹) in CSI-RS parameters and athird ID candidate value, so that the base station and the terminal candetermine one or more than one CSI-RS group related ID as a third IDcandidate value according to the number of antenna ports of one non-zeropower CSI-RS and/or reference signal pattern configuration and/orsubframe configuration. In another implementation manner, the candidatevalue of the third ID is generated according to multiple pieces ofCSI-RS configuration information, where the multiple pieces of CSI-RSconfiguration information may be among the multiple pieces of CSI-RSconfiguration information notified by the base station to the terminal.The base station and the terminal establish correspondence (for example,N_(ID3)=F(N_(CSI-RS) ¹,C_(CSI-RS) ¹,I_(CSI-RS) ¹,N_(CSI-RS) ²,C_(CSI-RS)²,I_(CSI-RS) ², . . . )) between the numbers (N_(CSI-RS) ¹,N_(CSI-RS) ²)of antenna ports of non-zero power CSI-RSs and/or reference signalpattern configuration (C_(CSI-RS) ¹,C_(CSI-RS) ²) and/or subframeconfiguration (I_(CSI-RS) ¹,I_(CSI-RS) ²) in CSI-RS parameters and athird ID candidate value, so that the base station and the terminal candetermine one or more than one CSI-RS group related ID as the third IDcandidate value according to the numbers of antenna ports of multiplenon-zero power CSI-RSs and/or reference signal pattern configurationand/or subframe configuration. Likewise, the third ID candidate valuemay also be obtained when correspondence between one or more of antennacluster serial numbers, or one or more of RRH serial numbers, or anindication of a user set, and an antenna cluster related ID, an RRHrelated ID, or a terminal group related ID used as the third IDcandidate value is established through a specific function according tothe one or more antenna cluster serial numbers, or the one or more RRHserial numbers, or a user group ID, so that the base station and theterminal can determine the third ID candidate value according to the oneor more antenna cluster serial numbers, or the one or more RRH serialnumbers, or the indication of a user set.

Alternatively

One or more of the candidate values of the third ID are fixed to one ormore of constants and are set in the terminal and the base station.

It should be noted that all or a part of the methods for the basestation to notify multiple candidate values of the third ID to theterminal may be simultaneously used for notifying the multiple candidatevalues of the third ID to the terminal. In this case, the base stationneeds to notify, through additional third ID value assigning methodsignaling, which may be UE specific high-layer signaling, for example,dedicated signaling in RRC signaling, the terminal of which method isadopted for each candidate value of the third ID, or the terminal ofwhich one or more of candidate values of the third ID each method isadopted for, and correspondence between parameter values in thesignaling and third ID value assigning methods needs to be configured inboth the base station and the terminal.

If the base station notifies multiple candidate values of the third IDto the terminal, the base station needs to further notify the terminalof which candidate value is to be selected. For example, similar to theforegoing embodiment, the base station notifies, through a scrambling IDor dedicated ID selection indication signaling, the terminal of which IDis to be selected. Definitely, in a situation of selective configurationof N_(ID1), if one of notification manners of the scrambling ID and thededicated ID selection indication signaling is adopted for N_(ID1), theother notification manner is adopted for N_(ID3) herein.

For example, the third ID has two candidate values, which are N_(ID3)_(_) ₀ and N_(ID3) _(_) ₁, and when the base station indicates a valueof the third ID to the terminal according to the notification manner inEmbodiment 2, that is, when the base station adopts the dedicated IDselection indication signaling, correspondence between values of Y inthe dedicated ID selection indication signaling and values of N_(ID3) isas follows:

$\quad\left\{ \begin{matrix}{{Y = 0},} & {N_{{ID}\; 3} = N_{{{ID}3\_}0}} \\{Y = 1} & {N_{{ID}\; 3} = N_{{ID}\; 3\_ 1}}\end{matrix} \right.$

When the base station indicates a value of the third ID to the terminalaccording to the notification manner in Embodiment 1, that is, through ascrambling ID, correspondence between scrambling IDs and the values ofN_(ID3) is as follows:

$\quad\left\{ \begin{matrix}{{n_{SCID} = 0},} & {N_{{ID}\; 3} = N_{{ID}\; 3\_ 0}} \\{n_{SCID} = 1} & {N_{{ID}\; 3} + N_{{ID}\; 3\_ 1}}\end{matrix} \right.$

In specific implementation of this embodiment, if the scrambling ID isused for indicating a value of an ID used for generating a referencesignal initialization sequence, for example, in an implementation mannerof using the scrambling ID to indicate a value of N_(ID1), or in animplementation manner of using the scrambling ID to indicate a value ofN_(ID3) and selecting a value for N_(ID1), or in an implementationmanner of using the scrambling ID to indicate a value of N_(ID3) andfixedly configuring N_(ID1) into a Group ID, a manner in which the basestation determines an ID and a spread spectrum sequence used forgenerating a demodulation reference signal for terminals scheduled overthe same time-frequency resource is the same as that in Embodiment 1.

In specific implementation of this embodiment, if the scrambling ID isnot used for indicating a value of an ID used for generating a referencesignal initialization sequence and is only used for indicating ascrambling ID for generating a reference signal initialization sequence,and the candidate IDs include the Group ID, a manner in which the basestation determines, for terminals scheduled over the same time-frequencyresource, an ID used for generating a reference signal initializationsequence, a spread spectrum sequence, and a scrambling ID is the same asthat in Embodiment 2.

In this embodiment, in a specific implementation manner in which all thecandidate IDs determined by the base station for the terminal do notinclude the Group ID, when the base station determines an ID used forgenerating a reference signal initialization sequence, and a spreadspectrum sequence, or determines an ID, a spread spectrum sequence, anda scrambling ID, for terminals scheduled over the same time-frequencyresource, when the implementation manner in Embodiment 1 or Embodiment 2is correspondingly adopted, the part in which a CoMP terminal isinvolved is excluded.

In this embodiment, specific implementation of other parts isimplemented with reference to Embodiment 1 or Embodiment 2, which is notdescribed herein again.

Exemplary Embodiment 8

In this embodiment, a formula for generating a reference signalinitialization sequence is different from that in Embodiment 7:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +ZN _(ID3) +n_(SCID)  Formula 20

N, and N_(ID2) may be fixedly configured into the same value ordifferent values among the Cell ID, or a cell group ID or an RRH groupID in the Group ID, or 0, and may also be selectively configured intothe same value or different values among the Cell ID, or a cell group IDor an RRH group ID in the Group ID, or 0. A method of selectiveconfiguration may be implemented with reference to the manner in any oneof Embodiment 3 to Embodiment 6, which is not described herein again.Values of X and Z are the same as those of X and Z involved in theforegoing embodiment. N_(ID3) is a third ID, and a candidate valueconfiguration solution of the third ID and an indication solutionrelated to the third ID of the base station are the same as thecandidate value configuration solution and the indication solution ofthe third ID in specific Embodiment 7.

The remaining implementation manners of this embodiment are the same asthose in Embodiment 7, which are not described herein again.

Persons of ordinary skill in the art should understand that all or apart of the steps of the method embodiments may be implemented by aprogram instructing relevant hardware. The program may be stored in acomputer-readable storage medium. When the program is executed, thecontents of the foregoing embodiments of the present invention areperformed. The storage medium here may be, for example, a ROM/RAM, amagnetic disk, or an optical disk.

An embodiment of the present invention further provides a networkdevice, and as shown in FIG. 5, the network device includes:

an ID selection module 51, configured to select, from candidate IDs, anID used for generating a reference signal initialization sequence for aterminal, where the candidate IDs include at least two IDs, and theselected ID does not include a scrambling ID; and

a reference signal initialization sequence generation module 52,configured to generate a reference signal initialization sequence forthe terminal according to the ID selected by the ID selection module 51.

A formula for the reference signal initialization sequence generationmodule 52 to generate the reference signal initialization sequence forthe terminal may be:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +n _(SCID)

n_(s) is a time slot number, n_(SCID) is a scrambling ID, and N_(ID) isthe ID used for generating the reference signal initialization sequenceand selected for the terminal from the candidate IDs. The candidate IDsinclude: a combination of any two or any more than two of a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID.

Alternatively, the formula for generating the reference signalinitialization sequence may be:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +n _(SCID)

n_(s) is a time slot number, X is a positive integer greater than orequal to 1, and n_(SCID) is a scrambling ID. A value of one of N_(ID1)and N_(ID2) is 0, and the other one is the ID used for generating thereference signal initialization sequence and selected for the terminalfrom the candidate IDs. Alternatively, N_(ID1) and N_(ID2) are differentIDs used for generating a reference signal initialization sequence andselected for the terminal from the candidate IDs. The candidate IDsinclude: a combination of any two or any more than two of an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID, aCSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID.

Alternatively, the formula for generating the reference signalinitialization sequence may be:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +ZN _(ID3) +n _(SCID)

n_(s) is a time slot number, Z is a positive integer greater than orequal to 1, and n_(SCID) is a scrambling ID.

N_(ID1) is a fixedly configured ID, where the fixedly configured ID is:a cell ID, an RRH ID, a cell group ID, an RRH group ID, a terminal groupID, a CSI-RS ID, a CSI-RS group ID, an antenna cluster ID, or a constantID. N_(ID3) is an ID selected for the terminal from third ID candidatevalues, where the third ID candidate values include: a combination ofany two or any more than two of an RRH ID, a cell group ID, an RRH groupID, a terminal group ID, a CSI-RS ID, a CSI-RS group ID, an antennacluster ID, and one or more than one constant ID, or the third IDcandidate values include: two or more than two terminal group relatedIDs; or the third ID candidate values include: two or more than two RRHgroup related IDs; or the third ID candidate values include: two or morethan two CSI-RS group related IDs; or the third ID candidate valuesinclude: two or more than two antenna cluster related IDs; or the thirdID candidate values include a combination of any two or any more thantwo of IDs in the candidate IDs, IDs in terminal group related IDs, RRHgroup related IDs, IDs in CSI-RS group related IDs, and IDs in antennacluster related IDs.

Alternatively, N_(ID3) is a fixedly configured ID, where the fixedlyconfigured ID is: a cell ID, an RRH ID, a cell group ID, an RRH groupID, a terminal group ID, a CSI-RS ID, a CSI-RS group ID, an antennacluster ID, or a constant ID; and N_(ID1) is an ID selected for theterminal from first ID candidate values, where the first ID candidatevalues include: a combination of any two or any more than two of thecell ID, the RRH ID, the cell group ID, the RRH group ID, the terminalgroup ID, the CSI-RS ID, the CSI-RS group ID, the antenna cluster ID,and one or more than one constant ID.

Alternatively, N_(ID1) is an ID selected for the terminal from first IDcandidate values, where the first ID candidate values include: acombination of any two or any more than two of a cell ID, an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID, aCSI-RS group ID, an antenna cluster ID, and a constant ID; and N_(ID3)is an ID selected for the terminal from third ID candidate values, wherethe third ID candidate values include: a combination of any two or anymore than two of an RRH ID, a cell group ID, an RRH group ID, a terminalgroup ID, a CSI-RS ID, a CSI-RS group ID, an antenna cluster ID, and oneor more than one constant ID; or the third ID candidate values include:two or more than two terminal group related IDs; or the third IDcandidate values include: two or more than two RRH group related IDs; orthe third ID candidate values include: two or more than two CSI-RS grouprelated IDs; or the third ID candidate values include: two or more thantwo antenna cluster related IDs; or the third ID candidate valuesinclude a combination of any two or any more than two of IDs in thecandidate IDs, IDs in the terminal group related IDs, the RRH grouprelated IDs, IDs in the CSI-RS group related IDs, and IDs in the antennacluster related IDs.

Alternatively, the formula for generating a reference signalinitialization sequence may be:

c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +ZN _(ID3) +n_(SCID)

n_(s) is a time slot number, X and Z are both positive integers greaterthan or equal to 1, and n_(SCID) is a scrambling ID.

N_(ID1) is a fixedly configured ID, where the fixedly configured ID is:a cell ID, an RRH ID, a cell group ID, an RRH group ID, a terminal groupID, a CSI-RS group ID, an antenna cluster ID or a constant ID, and anyone of an antenna cluster ID and a constant ID, or 0. N_(ID2) is afixedly configured ID, where the fixedly configured ID is: a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSgroup ID, an antenna cluster ID or a constant ID. N_(ID3) is an IDselected for the terminal from third ID candidate values, where thethird ID candidate values include: a combination of any two or any morethan two of an RRH ID, a cell group ID, an RRH group ID, a terminalgroup ID, a CSI-RS ID, a CSI-RS group ID, an antenna cluster ID, and oneor more than one constant ID; or the third ID candidate values include:two or more than two terminal group related IDs; or the third IDcandidate values include: two or more than two RRH group related IDs; orthe third ID candidate values include: two or more than two CSI-RS grouprelated IDs; or the third ID candidate values include: two or more thantwo antenna cluster related IDs; or the third ID candidate valuesinclude a combination of any two or any more than two of the IDs in thecandidate IDs, IDs in the terminal group related IDs, the RRH grouprelated IDs, IDs in the CSI-RS group related IDs, and IDs in the antennacluster related IDs.

Alternatively, N_(ID3) is a fixedly configured ID, where the fixedlyconfigured ID is: a cell ID, an RRH ID, a cell group ID, an RRH groupID, a terminal group ID, a CSI-RS group ID, an antenna cluster ID, or aconstant ID; N_(ID1) is an ID selected for the terminal from first IDcandidate values, where the first ID candidate values include: acombination of any two or any more than two of the cell ID, the RRH ID,the cell group ID, the RRH group ID, the terminal group ID, the CSI-RSID, the CSI-RS group ID, the antenna cluster ID, and one or more thanone constant ID; and N_(ID2) is an ID selected for the terminal fromsecond ID candidate values, where the second ID candidate valuesinclude: a combination of any two or any more than two of the cell ID,the RRH ID, the cell group ID, the RRH group ID, the terminal group ID,the CSI-RS group ID, the antenna cluster ID, and one or more than oneconstant ID.

Alternatively, N_(ID1) is an ID selected for the terminal from first IDcandidate values, where the first ID candidate values include: acombination of any two or any more than two of a cell ID, an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS group ID,an antenna cluster ID, and one or more than one constant ID; N_(ID2) isan ID selected for the terminal from second ID candidate values, wherethe second ID candidate values include: a combination of any two or anymore than two of a cell ID, an RRH ID, a cell group ID, an RRH group ID,a terminal group ID, a CSI-RS ID, a CSI-RS group ID, an antenna clusterID, and a constant ID; and N_(ID3) is an ID selected for the terminalfrom third ID candidate values, where the third ID candidate valuesinclude: a combination of any two or any more than two of an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID, aCSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID; or the third ID candidate values include: two or more thantwo terminal group related IDs; or the third ID candidate valuesinclude: two or more than two RRH group related IDs; or the third IDcandidate values include: two or more than two CSI-RS group related IDs;or the third ID candidate values include: two or more than two antennacluster related IDs; or the third ID candidate values include acombination of any two or any more than two of IDs in the candidate IDs,IDs in the terminal group related IDs, the RRH group related IDs, IDs inthe CSI-RS group related IDs, and IDs in the antenna cluster relatedIDs.

The terminal group related IDs are IDs generated by the network deviceaccording to indication information of a terminal set; the CSI-RS grouprelated IDs are IDs generated by the network device according to CSI-RSconfiguration information; the antenna cluster related IDs are IDsgenerated according to antenna cluster serial numbers; the RRH grouprelated IDs are IDs generated by the network device according to RRHserial numbers; and the terminal group related IDs are IDs generated bythe network device according to indication information of a terminalset.

The network device may be a base station, and may also be a terminal.

When the network device is a base station, as shown in FIG. 6a , thebase station includes:

an ID selection module 61, configured to select, from candidate IDs, anID used for generating a reference signal initialization sequence for aterminal, where the candidate IDs include at least two IDs, and theselected ID does not include a scrambling ID; and

a reference signal initialization sequence generation module 62,configured to generate a reference signal initialization sequence forthe terminal according to the ID selected by the ID selection module;

an indication generation module 63, configured to generate a referencesignal initialization sequence generation indication according to the IDselected by the ID selection module 61; and

a transceiver module 64, configured to deliver the reference signalinitialization sequence generation indication generated by theindication generation module to the terminal, so that the terminal cangenerate a reference signal initialization sequence according to theindication.

As shown in FIG. 6b , the base station may further include: a storagemodule 65.

The reference signal initialization sequence generation indicationincludes: DMRS port signaling; and the indication generation module 63is configured to generate the DMRS port signaling according to the IDselected for the terminal, and correspondence between scrambling IDs andcandidate IDs and a DMRS port configuration table that are stored in thestorage module 65.

Alternatively, the reference signal initialization sequence generationindication includes: dedicated ID selection indication signaling; andthe indication generation module 63 is configured to determine one ormore than one ID indication identifier value according to the IDselected for the terminal and correspondence between one or more thanone ID indication identifier value and candidate IDs that is stored inthe storage module 65, and generate the dedicated ID selectionindication signaling according to the determined ID indicationidentifier value.

Alternatively, the reference signal initialization sequence generationindication includes: DMRS port signaling and dedicated ID selectionindication signaling; and the indication generation module 63 isconfigured to determine one or more than one ID indication identifiervalue according to the ID selected for the terminal and correspondencebetween one or more than one ID indication identifier value andcandidate IDs that is stored in the storage module 65, generate thededicated ID selection indication signaling according to the determinedID indication identifier value, and determine the DMRS port signalingaccording to the ID selected for the terminal, a port configurationtable stored in the storage module 65, and correspondence betweenscrambling IDs and candidate IDs that is stored in the storage module65.

Alternatively, the reference signal initialization sequence generationindication includes: DMRS port signaling and more than one piece ofdedicated ID selection indication signaling; and the indicationgeneration module 63 is configured to determine a scrambling ID used forindicating the terminal, and more than one ID indication identifiervalue, according to the ID selected for the terminal and correspondencethat is set by the indication generation module 63 for each ID andstored in the storage module 65, generate the DMRS port signalingaccording to the determined scrambling ID and a DMRS port configurationtable stored in the storage module 65, and generate the dedicated IDselection indication signaling according to the determined ID indicationidentifier value. The correspondence set for each ID in the storagemodule 65 includes correspondence between scrambling IDs and candidateIDs and correspondence between ID indication identifier values andcandidate IDs.

As shown in FIG. 6c or FIG. 6d , the base station may further include: ascheduling module 66, where

the scheduling module 66 is configured to schedule, over the sametime-frequency resource, multiple terminals including a MU-MIMOterminal, and send a first notification to the ID selection module 61;and

the ID selection module 61 is further configured to preferentiallyselect, for the terminal performing MU-MIMO and according to the firstnotification sent by the scheduling module, an ID used for generating areference signal initialization sequence.

The scheduling module 66 may be further configured to send a secondnotification to the ID selection module 61 when it is determined thatthe terminal performing MU-MIMO include a CoMP terminal and a non-CoMPterminal.

The ID selection module 61 is further configured to, in the terminalperforming MU-MIMO and according to the second notification sent by thescheduling module 66, preferentially select, for the CoMP terminal, anID used for generating a reference signal initialization sequence, andselect, for the non-CoMP terminal, an ID used for generating a referencesignal initialization sequence the same as that selected for the CoMPterminal.

The ID selection module 61 is further configured to determine thecandidate IDs. The candidate IDs determined by the ID selection module61 may be candidate IDs for terminals to be scheduled, where thecandidate IDs for the terminals to be scheduled are determined base oncandidate IDs set by the base station by default, for example, a cell IDand a cell group ID (or a combination of any other two or more than twoof the candidate IDs described in the above method embodiment). The IDselection module 61 may also generate the candidate IDs based onspecific parameters, and reference can be specifically made to detaileddescription of generation of candidate IDs through parameters, forexample, parameters such as a CSI-RS, in the method embodiment. The IDselection module 61 may also determine more than one constant ID as thecandidate IDs by default. The ID selection module 61 may also determinethe candidate IDs in any two manners or a combination of multiplemanners in the various manners described above. For specificimplementation of the various manners, reference can be made to relevantdescription of determination of the candidate IDs in the part of themethod embodiment.

The transceiver module 64 may be further configured to deliver thedetermined constant IDs to the terminal through high-layer signaling.Definitely, the transceiver module 64 may also be further configured todeliver the specific parameters used for generating the candidate IDs tothe terminal, or deliver other determined candidate IDs to the terminal.Specifically, in the method embodiment, all solutions involved indelivery of information by the base station to the terminal areperformed by the transceiver module 64, and the remaining involvedprocessing solutions are performed by corresponding modules according tosteps performed in the solutions.

When the network device is a terminal, as shown in FIG. 7a , theterminal includes:

a receiving module 71, configured to receive a reference signalinitialization sequence generation indication from a base station;

an ID selection module 72, configured to select, from candidate IDsaccording to the indication received by the receiving module 71, an IDused for generating a reference signal initialization sequence for theterminal, where the candidate IDs include at least two IDs, and theselected ID does not include a scrambling ID; and a reference signalinitialization sequence generation module 73, configured to generate areference signal initialization sequence for the terminal according tothe ID selected by the ID selection module 72.

As shown in FIG. 7b , the terminal may further include: a storage module74.

The reference signal initialization sequence generation indicationreceived by the receiving module 71 includes: DMRS port signaling; andthe ID selection module 72 is configured to determine a scrambling IDaccording to the DMRS port signaling received by the receiving module 71and a DMRS port configuration table stored in the storage module 74, anddetermine the ID used for generating the reference signal initializationsequence according to the determined scrambling ID and correspondencebetween scrambling IDs and candidate IDs that is stored in the storagemodule 73.

Alternatively, the reference signal initialization sequence generationindication includes: dedicated ID selection indication signaling; andthe ID selection module 72 is configured to determine the ID used forgenerating the reference signal initialization sequence according to anID indication identifier value in the dedicated ID selection indicationsignaling received by the receiving module 71 and correspondence betweenID indication identifier values and candidate IDs that is stored in thestorage module 73.

Alternatively, the reference signal initialization sequence generationindication includes: DMRS port signaling and dedicated ID selectionindication signaling; and the ID selection module 72 is configured todetermine the ID used for generating the reference signal initializationsequence according to an ID indication identifier value in the dedicatedID selection indication signaling received by the receiving module 71,correspondence between ID indication identifier values and candidate IDsthat is stored in the storage module 73, the DMRS port signalingreceived by the receiving module 71, a DMRS port configuration tablestored in the storage module 73, and correspondence between scramblingIDs and candidate IDs that is stored in the storage module 73.

Alternatively, the reference signal initialization sequence generationindication includes: DMRS port signaling and more than one piece ofdedicated ID selection indication signaling; and the ID selection module72 is configured to determine the ID used for generating the referencesignal initialization sequence according to each ID indicationidentifier value in the dedicated ID selection indication signalingreceived by the receiving module 71, correspondence between IDindication identifier values in the dedicated ID selection indicationsignaling and candidate IDs that is stored in the storage module 73, theDMRS port signaling received by the receiving module 71, a DMRS portconfiguration table stored in the storage module 73, and correspondencebetween scrambling IDs and candidate IDs that is stored in the storagemodule 73.

The ID selection module 72 in the terminal may be further configured todetermine the candidate IDs. Specifically, a solution for the IDselection module 72 in the terminal to determine the candidate IDscorresponds to the solution for the base station to determine candidateIDs. For example, if the base station generates the candidate IDs basedon certain specific parameters and sends these specific parameters tothe terminal, the receiving module 71 in the terminal sends thesespecific parameters to the ID selection module 72 after receiving thesespecific parameters. Based on these specific parameters, the IDselection module 72 generates the candidate IDs in a manner the same asthat of the base station. In another example, if the base station setsthe candidate IDs to a cell ID and a cell group ID by default, theterminal also sets the candidate IDs to the cell ID and the cell groupID by default. The ID selection module 72 determines the cell ID and thecell group ID received from the base station as the candidate IDs. Otherspecific determination manners are not listed herein one by one, and inspecific implementation, reference can be made to relevant descriptionin the method embodiment or the base station embodiment described above.

The network device, including the base station or the terminal, mayfurther include: a demodulation reference signal generation module,configured to generate a demodulation reference signal according to thereference signal initialization sequence generated by the referencesignal initialization sequence generation module, for the terminal toperform channel estimation.

In the embodiments of the present invention, an ID used for generating ademodulation initialization sequence is selected for the terminal fromcandidate IDs, and more manners of generating a reference signalinitialization sequence are provided. In the solution that the basestation sends a reference signal initialization sequence generationindication to the terminal through the dedicated ID selection indicationsignaling, on the basis that different demodulation reference signalsequences are determined for different terminals through scramblingcodes, it is added that more types of reference signal initializationsequences can be generated for the terminal by selecting different IDs,thereby increasing system capacity. Moreover, the same ID used forgenerating a reference signal initialization sequence is selected forthe CoMP terminal and the non-CoMP terminal performing MU-MIMO, ordifferent IDs but the same spread spectrum sequence are selected, sothat the CoMP terminal and the non-CoMP terminal are orthogonal to eachother, thereby ensuring implementation of the MU-MIMO and improving theperformance of the terminal.

Although the present invention is shown and described with reference tosome exemplary embodiments of the present invention, persons of ordinaryskill in the art should understand that various changes in forms anddetails may be made to the present invention without departing from thespirit and scope of the present invention.

1. A method for configuring a reference signal sequence, comprising:generating, by a base station, a reference signal initializationsequence for a terminal according to a first identifier (ID) and ascrambling ID, wherein the first ID is an ID among candidate IDs, andthe candidate IDs comprise at least a cell ID and two constant IDs;determining, by the base station, a signaling indicating the scramblingID; and sending, by the base station, a downlink scheduling signalingincluding the signaling to the terminal.
 2. The method according toclaim 1, wherein the reference signal initialization sequence is afunction of the first ID and the scrambling ID.
 3. The method accordingto claim 1, wherein the first ID corresponds to the scrambling ID, andthe determining, by the base station, the signaling comprises:determining, by the base station, the signaling according to thescrambling ID and a relationship between the signaling and thescrambling ID.
 4. The method according to claim 1, wherein the twoconstant IDs are determined by the base station and are sent to theterminal through high-layer signaling.
 5. The method according to claim1, wherein the scrambling ID is included in a plurality of scramblingIDs, and each of the scrambling IDs corresponds to at least one of thecandidate IDs.
 6. The method according to claim 1, wherein when thefirst ID is one of the constant IDs; the reference signal initializationsequence fulfills:c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +ZN _(ID3) +n _(SCID) whereinn_(s) is a time slot number, Z is a positive integer greater than orequal to 1, n_(SCID) is the scrambling ID, and N_(ID1) and N_(ID3) arethe one of the constant IDs; or, the reference signal initializationsequence fulfills:c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +ZN _(ID3) +n_(SCID) wherein n_(s) is a time slot number, X and Z are both positiveintegers greater than or equal to 1, n_(SCID) is the scrambling ID,N_(ID1) and N_(ID2) are the one of the constant IDs, and N_(ID3) is acell ID, an RRH ID, a cell group ID, an RRH group ID, a terminal groupID, a CSI-RS group ID, an antenna cluster ID, or a constant ID; orN_(ID3) is an ID from a third ID candidate values, wherein the third IDcandidate values comprise: a combination of any two or any more than twoof an RRH ID, a cell group ID, an RRH group ID, a terminal group ID, aCSI-RS ID, a CSI-RS group ID, an antenna cluster ID, and one or morethan one constant ID; or the third ID candidate values comprise: two ormore than two terminal group related IDs; or the third ID candidatevalues comprise: two or more than two RRH group related IDs; or thethird ID candidate values comprise: two or more than two CSI-RS grouprelated IDs; or the third ID candidate values comprise: two or more thantwo antenna cluster related IDs; or the third ID candidate valuescomprise a combination of any two or any more than two of IDs in thecandidate IDs, IDs in the terminal group related IDs, the RRH grouprelated IDs, IDs in the CSI-RS group related IDs, and IDs in the antennacluster related IDs; wherein the terminal group related IDs are IDsgenerated by the network device according to indication information of aterminal set; the CSI-RS group related IDs are IDs generated by thenetwork device according to CSI-RS configuration information; theantenna cluster related IDs are ID generated according to antennacluster serial numbers; the RRH group related IDs are IDs generated bythe network device according to RRH serial numbers; and the terminalgroup related IDs are IDs generated by the network device according toindication information of a terminal set; or, N_(ID1) and N_(ID3) arethe one of the constant IDs, and N_(ID1) is an ID from a second IDcandidate values, wherein the second ID candidate values comprise: acombination of any two or any more than two of a cell ID, an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID, aCSI-RS group ID, an antenna cluster ID, and a constant ID; or, N_(ID2)and N_(ID3) are the one of the constant IDs, and N_(ID1) is an ID from afirst ID candidate values, wherein the first ID candidate valuescomprise: a combination of any two or any more than two of a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID.
 7. A base station, comprising: a processor coupled to amemory storing instructions that, when executed by the processor, causethe processor to perform operations comprising: generating a referencesignal initialization sequence for a terminal according to a firstidentifier (ID) and a scrambling ID, wherein the first ID is an ID amongcandidate IDs, and the candidate IDs comprise at least a cell ID and twoconstant IDs; and determining a signaling indicating the scrambling ID;and a transmitter, configured to send a downlink scheduling signalingincluding the signaling to the terminal.
 8. The base station accordingto claim 7, wherein the reference signal initialization sequence is afunction of the first ID and the scrambling ID.
 9. The base stationaccording to claim 7, wherein the first ID corresponds to the scramblingID, and the determining the signaling comprises: determining thesignaling according to the scrambling ID and a relationship between thesignaling and the scrambling ID.
 10. The base station according to claim7, wherein the two constant IDs are determined by the processor and aresent to the terminal by the transmitter through high-layer signaling.11. The base station according to claim 7, wherein the scrambling ID isincluded in a plurality of scrambling IDs, and each of the scramblingIDs corresponds to at least one of the candidate IDs.
 12. The basestation according to claim 7, wherein when the first ID is one of theconstant IDs; the reference signal initialization sequence fulfills:c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +ZN _(ID3) +n _(SCID) whereinn_(s) is a time slot number, Z is a positive integer greater than orequal to 1, n_(SCID) is the scrambling ID, and N_(ID1) and N_(ID3) arethe one of the constant IDs; or, the reference signal initializationsequence fulfills:c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +ZN _(ID3) +n_(SCID) wherein n_(s) is a time slot number, X and Z are both positiveintegers greater than or equal to 1, n_(SCID) is the scrambling ID,N_(ID1) and N_(ID2) are the one of the constant IDs, and N_(ID3) is acell ID, an RRH ID, a cell group ID, an RRH group ID, a terminal groupID, a CSI-RS group ID, an antenna cluster ID, or a constant ID; orN_(ID3) is an ID from a third ID candidate values, wherein the third IDcandidate values comprise: a combination of any two or any more than twoof an RRH ID, a cell group ID, an RRH group ID, a terminal group ID, aCSI-RS ID, a CSI-RS group ID, an antenna cluster ID, and one or morethan one constant ID; or the third ID candidate values comprise: two ormore than two terminal group related IDs; or the third ID candidatevalues comprise: two or more than two RRH group related IDs; or thethird ID candidate values comprise: two or more than two CSI-RS grouprelated IDs; or the third ID candidate values comprise: two or more thantwo antenna cluster related IDs; or the third ID candidate valuescomprise a combination of any two or any more than two of IDs in thecandidate IDs, IDs in the terminal group related IDs, the RRH grouprelated IDs, IDs in the CSI-RS group related IDs, and IDs in the antennacluster related IDs; wherein the terminal group related IDs are IDsgenerated by the network device according to indication information of aterminal set; the CSI-RS group related IDs are IDs generated by thenetwork device according to CSI-RS configuration information; theantenna cluster related IDs are ID generated according to antennacluster serial numbers; the RRH group related IDs are IDs generated bythe network device according to RRH serial numbers; and the terminalgroup related IDs are IDs generated by the network device according toindication information of a terminal set; or, N_(ID1) and N_(ID3) arethe one of the constant IDs, and N_(ID2) is an ID from a second IDcandidate values, wherein the second ID candidate values comprise: acombination of any two or any more than two of a cell ID, an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID, aCSI-RS group ID, an antenna cluster ID, and a constant ID; or, N_(ID2)and N_(ID3) are the one of the constant IDs, and N_(ID1) is an ID from afirst ID candidate values, wherein the first ID candidate valuescomprise: a combination of any two or any more than two of a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID.
 13. A non-transitory computer-readable storage mediumhaving programming instructions stored thereon which, when executed by aprocessor, cause the processor to perform operations comprising:receiving a downlink scheduling signaling including a signaling from abase station, wherein the signaling indicates a scrambling identifier(ID); selecting a first ID for generating a reference signalinitialization sequence from candidate IDs according to the signaling,wherein the candidate IDs comprise at least a cell ID and two constantIDs; and generating a reference signal initialization sequence accordingto the first ID and the scrambling ID.
 14. The non-transitorycomputer-readable storage medium according to claim 13, wherein thereference signal initialization sequence is a function of the first IDand the scrambling ID.
 15. The non-transitory computer-readable storagemedium according to claim 13, wherein the two constant IDs are receivedthrough high-layer signaling from the base station.
 16. Thenon-transitory computer-readable storage medium according to claim 13,wherein the first ID corresponds to the scrambling ID; the selecting afirst ID comprises: determining the scrambling ID according to thesignaling; and selecting the first ID from candidate IDs according tothe scrambling ID.
 17. The non-transitory computer-readable storagemedium according to claim 13, wherein the scrambling ID is included in aplurality of scrambling IDs, and each of the plurality of scrambling IDscorresponds to at least one of the candidate IDs; the selecting thefirst ID comprises: determining the scrambling ID according to thesignaling; and selecting the first ID from candidate IDs according tothe scrambling ID and a correspondence between the each of thescrambling IDs and the at least one of the candidate IDs.
 18. Thenon-transitory computer-readable storage medium according to claim 13,wherein when the first ID is one of the constant IDs; the referencesignal initialization sequence fulfills:c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +ZN _(ID3) +n _(SCID) whereinn_(s) is a time slot number, Z is a positive integer greater than orequal to 1, n_(SCID) is the scrambling ID, and N_(ID1) and N_(ID3) arethe one of the constant IDs; or, the reference signal initializationsequence fulfills:c _(init)=(└n _(s)/2┘+1)·(2N _(ID1)+1)·2¹⁶ +XN _(ID2) +ZN _(ID3) +n_(SCID) wherein n_(s) is a time slot number, X and Z are both positiveintegers greater than or equal to 1, n_(SCID) is the scrambling ID,N_(ID1) and N_(ID2) are the one of the constant IDs, and N_(ID3) is acell ID, an RRH ID, a cell group ID, an RRH group ID, a terminal groupID, a CSI-RS group ID, an antenna cluster ID, or a constant ID; orN_(ID3) is an ID from a third ID candidate values, wherein the third IDcandidate values comprise: a combination of any two or any more than twoof an RRH ID, a cell group ID, an RRH group ID, a terminal group ID, aCSI-RS ID, a CSI-RS group ID, an antenna cluster ID, and one or morethan one constant ID; or the third ID candidate values comprise: two ormore than two terminal group related IDs; or the third ID candidatevalues comprise: two or more than two RRH group related IDs; or thethird ID candidate values comprise: two or more than two CSI-RS grouprelated IDs; or the third ID candidate values comprise: two or more thantwo antenna cluster related IDs; or the third ID candidate valuescomprise a combination of any two or any more than two of IDs in thecandidate IDs, IDs in the terminal group related IDs, the RRH grouprelated IDs, IDs in the CSI-RS group related IDs, and IDs in the antennacluster related IDs; wherein the terminal group related IDs are IDsgenerated by the network device according to indication information of aterminal set; the CSI-RS group related IDs are IDs generated by thenetwork device according to CSI-RS configuration information; theantenna cluster related IDs are ID generated according to antennacluster serial numbers; the RRH group related IDs are IDs generated bythe network device according to RRH serial numbers; and the terminalgroup related IDs are IDs generated by the network device according toindication information of a terminal set; or, N_(ID1) and N_(ID3) arethe one of the constant IDs, and N_(ID2) is an ID from a second IDcandidate values, wherein the second ID candidate values comprise: acombination of any two or any more than two of a cell ID, an RRH ID, acell group ID, an RRH group ID, a terminal group ID, a CSI-RS ID, aCSI-RS group ID, an antenna cluster ID, and a constant ID; or, N_(ID2)and N_(ID3) are the one of the constant IDs, and N_(ID1) is an ID from afirst ID candidate values, wherein the first ID candidate valuescomprise: a combination of any two or any more than two of a cell ID, anRRH ID, a cell group ID, an RRH group ID, a terminal group ID, a CSI-RSID, a CSI-RS group ID, an antenna cluster ID, and one or more than oneconstant ID.